| A | B |
|---|
| disease | any change in the body that keeps the body from working normally |
| symptoms | changes that a disease causes in the body |
| infectious disease | disease that can be passed from one person to another |
| non-infectious disease | disease that can't be passed from one person to another |
| germs | tiny living things that cause infectious disease and can be seen only by a microscope |
| bacteria | single-celled living things that grow just about everywhere; some are germs |
| virus | smallest germ |
| ways to keep body healthy | eat well, get regular exercise, get enough sleep, keep body clean |
| immune system | a body system that defends against germs by attacking and destroying pathogens as they enter the body |
| antibiotic | drug that kills bacteria |
| prescription medicine | drug obtained only by a written order from a doctor |
| over the counter medicine | medicine that can be bought without a doctor's order |
| antibody | protein produced in the blood that destroys or weakens bacteria and other pathogens |
| immunity | the body's resistance to a disease or infection |
| vaccination | shot given to provide immunity from a certain disease |
| pathogen | a microorganism that can cause a disease |
| secondhand smoke | smoke from another person's tobacco |
| drug | any chemical that changes the way our mind or body works |
| illegal drug | drug that is so dangerous it is against the law for anyone to use it |
| toxin | a poison produced by an organism |
